Steam-boiler furnace.



J. POMEROY. STEAM BOILER FURNACE. APPLICATION FILLED we. 10. 1909.

991,885. Patented May 9, 1911.. I

INVENTOR THE mamas PETERS 0a., WASHINGTON, u. c.

- 5, 6 and 7 are enlarged details (broken) JOHN IPOMEROY, OF WESTMELBOURNE, VICTORIA, AUSTRALIA.

STEAM-BOILER FURNACE.

Application filed August 10,

To all whom it may concern:

Be it known that I, J OHN PoMERoY, a subject of the King of GreatBritain, residing at Capel Street, l'Vest Melbourne, in the State ofVictoria, Commonwealth of Australia, inventor, have inventedImprovements in Steam-Boiler Furnaces, of which the following is aspecification.

The objects of this invention are to effect a saving of fuel, insurecomplete combustion and minimize the smoke. These objects areaccomplished by forming at the back of the furnace an air chamber, whichcommunicates with the ash pit, and is formed by a series of curvedspaced bars which constitute a hollow fire bridge located between theinner ends of the ordinary fire bars and the furnace bridge. Heated airand steam are introduced into said chamber and delivered through thehollow bridge into the flames of the furnace for the purpose ofeffecting complete combustion and keeping the interstices of the firebridge clear. The bars of the hollow bridge are independently secured inposition so that when any particular one is burned or worn it isunnecessary to do more than replace such damaged one.

The invention is illustrated by the accompanying drawings whereof;

Figure 1 is a vertical transverse section (broken) through the furnacetube of one type of boiler showing the invention applied thereto. Fig. 2is a longitudinal section (broken) on line EIEI, Fig. 1. Figs. 3, 1,

of parts of the invention.

According to this invention an arched hollow metallic fire bridge 1 isformed against the bridge 2 in the furnace tube 3 of the boiler. Saidmetallic fire bridge consists of a number of independent removablemetallic bars 4, each curved rearwardly at the upper end and providedwith a locking bead 5, Fig. 1, which fits into a hole 6 formed in a capplate 7 and is adapted to interlock with a recess 8 formed in the backtop edge of said hole 6. Said cap plate 7 is preferably of angular shapeand is adapted to be seated upon or secured to the furnace bridge 2, andit is formed with a curve 7 about its front top edge. The rear lower endof said bar is formed with a rabbet 9, Fig. 7, which engages withacorrespondingly shaped upwardly extending bar 10 formed on a transverseribbed plate constituting the base 11 of the metallic fire bridge.

Specification of Letters Patent.

Patented May 9, 1911.

1909. Serial No. 512,177.

The lower end of said bar rests on the base and has an angular nick 12in its front edge below which is an inclined forward projecting foot 13,while both ends of said bars are formed on each side with contact nibs14c, 15, to space the bars and form regular interstices 16 for thepurpose of admitting the steam or heated air or both. The space behindsaid bridge constitutes an air chamber 17 which communicates with theash pit 18 through the medium of an opening 19 in the base 11, which iscont-rolled by a damper 20. Within said chamber is a pipe 21 secured tothe base and provided along its horizontal portion with a series of jets22 and steam is communicated to said pipe by another pipe 23 detachablyconnected thereto and leading through the ash pit to the source of steamsupply.

In setting up the fire bridge, the upper end of each bar is firstinserted in a hole 6 in the cap plate 7 and interlocked therewith andits lower end is then dropped on the base so that the horizontal bar 10fits into the rabbet 9 after which an ordinary fire bar 24 of thefurnace is placed in position so that it rests upon the inclined foot 13while its end engages with 'the nick 12 thereby locking the whole of themetallic bridge firmly in position. It will thus be evident that whenall the bars 4 are placed side by side in position that the whole, byreason of the contact nibs 14, 15, constitutes a hollow fire bridge withinterstices 16 in its front, while any individual bar may be removed andreplaced by simply raising the corresponding or ordinary furnace bar 24off the inclined foot 13 of said bridge bar. In cases where a supply ofheated air is available it may be conducted by a pipe 25 through the ashpit 18 and be delivered by means of jets 26 or otherwise into the airchamber 17 thereby supplying hotter air than can be obtained by thatpassing through the ash pit. The steam which is sprayed through thehollow fire bridge combines with the gases of the furnace and produces amore complete combustion and this is assisted by the heated airintroduced through the ash pit into said chamber and which is deliveredthrough said fire bridge also into the flames of the furnace.

Having now particularly described and ascertained the nature of my saidinvention and in what manner thesame is to be perform-ed, I declare thatwhat I claim is;

1. In a steam boiler furnace, the combination with the grate bars andthe fire bridge, of a plurality of bars interlocking at their upper endwith the top of the fire bridge, and a support for their lower ends,each of said bars, at their lower ends having a projecting portion onwhich rests the end of a grate bar.

2. In steam boiler furnaces, the combination with the grate bars andfire bridge, of a cap plate on said fire bridge, a base having anupwardly extending projection thereon, said cap plate having a pluralityof holes therein and a recess in the back top edge of each of saidholes, a metallic bridge supported upon the base and formed of a numberof independent bars curved rearwardly at the upper end and provided ontheir sides at each end with contactspacing nibs,the upper end of eachbar having a locking bead adapted to enter one of the holes in the capplate and engage with said recess formed in the back top edge of saidhole, while the lower end of each bar has a rabbet adapted to engage theupwardly extending projection on said base, and an angular nick in itslower front edge below which is an inclined forwardly projecting foot,upon which rests the grate bar for the purpose described.

3. In steam boiler furnaces, the combination with the fire bars and firebridge, of a base, a bar extending upwardly therefrom, a metallic bridgesupported upon the base and formed of a number of independent barscurved rearwardly at the upper end and provided on their sides at eachend with contact spacing nibs, a metallic cap plate on the fire bridgeformed with a curved front top edge and with a series of holes havingrecesses in the back top edges thereof, a locking head on the upper endof each bar of the metallic bridge adapted to enter the correspondinghole in said plate and engage the recess thereof, each bar having arabbet in the rear lower edge thereof adapted to engage said bar on thebase, and an angular nick in the front edge of each bar, an inclinedforwardly projecting foot below such nick upon which a correspondingfire bar rests, a damper for controlling the air delivery into the airchamber between said fire bridges, and a steam pipe provided with jetsin said chamber.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOHN POMEROY. itnesses ED\VARD WATERS, EDWARD A. lVA'rnns.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

